Sidansvarig: Webbredaktion
Sidan uppdaterades: 2012-09-11 15:12
| Författare |
R. Sharma N. Sisodia Philipp Dürrenfeld Johan Åkerman P. K. Muduli |
|---|---|
| Publicerad i | Physical Review B |
| Volym | 96 |
| Nummer/häfte | 2 |
| ISSN | 2469-9950 |
| Publiceringsår | 2017 |
| Publicerad vid |
Institutionen för fysik (GU) |
| Språk | en |
| Ämnesord | phase-locking, driven, modulation, emission, devices |
| Ämneskategorier | Fysik |
We report on time-domain stability of the parametric synchronization in a spin-torque nano-oscillator (STNO) based on a magnetic tunnel junction. Time-domain measurements of the instantaneous frequency (f(i)) of a parametrically synchronized STNO showrandom short-term unlocking of the STNO signal for low injected radio-frequency (RF) power, which cannot be revealed in time-averaged frequency domain measurements. Macrospin simulations reproduce the experimental results and reveal that the random unlocking during synchronization is driven by thermal fluctuations. We show that by using a high injected RF power, random unlocking of the STNO can be avoided. However, a perfect synchronization characterized by complete suppression of phase noise, so-called phase noise squeezing, can be obtained only at a significantly higher RF power. Our macrospin simulations suggest that a lower temperature and a higher positive ratio of the fieldlike torque to the spin transfer torque reduce the threshold RF power required for phase noise squeezing under parametric synchronization.
GÖTEBORGS UNIVERSITET • Box 100 • 405 30 Göteborg • Telefon: 031 786 0000
Kontakt • Organisationsnummer: 202100-3153 • Om webbplatsen
Facebook
Twitter
Instagram
Youtube